Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/lock.py @ 1985:c577689006fa

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Adapted behaviour of ui.username() to documentation and mention it explicitly: Searched in this order: $HGUSER, [ui] section of hgrcs, $EMAIL and stop searching if one of these is set. Abort if found username is an empty string to force specifying the commit user elsewhere, e.g. with line option or repo hgrc. If not found, use $LOGNAME or $USERNAME +"@full.hostname".
author Thomas Arendsen Hein <thomas@intevation.de>
date Tue, 21 Mar 2006 15:33:29 +0100
parents d314a89fa4f1
children ff5c9a92f556
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1 # lock.py - simple locking scheme for mercurial
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2 #
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3 # Copyright 2005 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 from demandload import *
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9 demandload(globals(), 'errno os socket time util')
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10
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11 class LockException(Exception):
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12 pass
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13 class LockHeld(LockException):
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14 pass
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15 class LockUnavailable(LockException):
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16 pass
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17
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18 class lock(object):
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19 # lock is symlink on platforms that support it, file on others.
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20
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21 # symlink is used because create of directory entry and contents
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22 # are atomic even over nfs.
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23
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24 # old-style lock: symlink to pid
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25 # new-style lock: symlink to hostname:pid
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26
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27 def __init__(self, file, timeout=-1, releasefn=None):
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28 self.f = file
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29 self.held = 0
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30 self.timeout = timeout
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31 self.releasefn = releasefn
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32 self.id = None
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33 self.host = None
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34 self.pid = None
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35 self.lock()
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36
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37 def __del__(self):
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38 self.release()
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39
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40 def lock(self):
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41 timeout = self.timeout
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42 while 1:
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43 try:
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44 self.trylock()
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45 return 1
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46 except LockHeld, inst:
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47 if timeout != 0:
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48 time.sleep(1)
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49 if timeout > 0:
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50 timeout -= 1
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51 continue
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52 raise inst
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53
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54 def trylock(self):
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55 if self.id is None:
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56 self.host = socket.gethostname()
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57 self.pid = os.getpid()
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58 self.id = '%s:%s' % (self.host, self.pid)
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59 while not self.held:
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60 try:
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61 util.makelock(self.id, self.f)
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62 self.held = 1
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63 except (OSError, IOError), why:
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64 if why.errno == errno.EEXIST:
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65 locker = self.testlock()
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66 if locker:
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67 raise LockHeld(locker)
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68 else:
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69 raise LockUnavailable(why)
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70
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71 def testlock(self):
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72 '''return id of locker if lock is valid, else None.'''
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73 # if old-style lock, we cannot tell what machine locker is on.
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74 # with new-style lock, if locker is on this machine, we can
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75 # see if locker is alive. if locker is on this machine but
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76 # not alive, we can safely break lock.
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77 locker = util.readlock(self.f)
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78 c = locker.find(':')
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79 if c == -1:
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80 return locker
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81 host = locker[:c]
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82 if host != self.host:
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83 return locker
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84 try:
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85 pid = int(locker[c+1:])
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86 except:
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87 return locker
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88 if util.testpid(pid):
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89 return locker
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90 # if locker dead, break lock. must do this with another lock
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91 # held, or can race and break valid lock.
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92 try:
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93 l = lock(self.f + '.break')
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94 l.trylock()
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95 os.unlink(self.f)
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96 l.release()
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97 except (LockHeld, LockUnavailable):
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98 return locker
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99
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100 def release(self):
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101 if self.held:
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102 self.held = 0
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103 if self.releasefn:
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104 self.releasefn()
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105 try:
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106 os.unlink(self.f)
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107 except: pass
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108